Free Formula is best thing that ever happened to Formula racing.
It has really reduced the intimidation factor of racing and larger sails etc.
I'll attach the poster that will give you a good idea.
Basically you can rock up to any event with any equipment that can get you around a reduced length course.
You still get to do the exciting part of the race i.e. start together with the whole fleet, but you don't have to waste all your energy doing the full length course.
This also allows you to try gear before committing to buying.